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Free fall of concrete - Concrete pour over a standing water in a caisson
3

Free fall of concrete - Concrete pour over a standing water in a caisson

Free fall of concrete - Concrete pour over a standing water in a caisson

(OP)
Hello all,

Does anyone try pouring an anti-washout concrete (SCC)over a standing water in a caisson? Is this possible?

Also, the dewatering of the caisson is not possible or the rate of water intake is higher than the dewatering rate.

Looking for your thoughts and help.

Thanks.

RE: Free fall of concrete - Concrete pour over a standing water in a caisson

3
Dont try it!!! Use a tremmie

RE: Free fall of concrete - Concrete pour over a standing water in a caisson

You need to make your caisson less porous.

Or get bigger pumps.

More details needed.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

RE: Free fall of concrete - Concrete pour over a standing water in a caisson

agree with miningman, tremie the concrete in. Essentially this is a pipe that you start at the bottom of your caisson and pump the concrete in under the water. As the concrete fills the caisson hole, it will push the water up.

RE: Free fall of concrete - Concrete pour over a standing water in a caisson

ebooya,

I agree with miningman & Jayrod12, use a tremmie to place the concrete below the water surface.

As you place the concrete raise the bottom of the tremmie pipe (maybe a canvas tube) as the concrete is placed. Always keep the bottom of the tremmie tube below the top of the new concrete so there is a seal.

Any contractor who wants to bid on the job should be familiar with the concept.

Jim

RE: Free fall of concrete - Concrete pour over a standing water in a caisson

It's tremie, not tremmie. And that is the method you have to use if you want sound concrete placement under water. Never heard of a canvas tube being used, but maybe...

The basics here:
https://en.wikipedia.org/wiki/Tremie

RE: Free fall of concrete - Concrete pour over a standing water in a caisson

(OP)
Thank you all for your feedback and your responses. I appreciate it.

RE: Free fall of concrete - Concrete pour over a standing water in a caisson

Your are better off to dewater your cofferdams with submersible pumps before the concrete pours. The tremie pours we did were to seal up the bottom of the cofferdams before the concrete pours.

RE: Free fall of concrete - Concrete pour over a standing water in a caisson

Quote (Your are better off to dewater your cofferdams)


I've done fully submerged coffer dams by tremie method...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

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